Floor abrading machine



May 7, 1940. B. A. CASPER FLOOR4 -.ABRAD1NG MACHINE Filed Aug. 2o. 19:56 4 sheets-sneet'l l Inl/enla?" May 7, 1940 B. A. CASPER K 2,199,615

OOR ABRADING MACHINE f77/venia? d; w morneys May 7, 1940# B. A. CASPER FLOOR ABRDING MACHINE Filed Aug. 2o, 195e 4 Sheetrs--Sheejl 4 f reference characters refer to similar Patented May 7, 1940 UNITED STATES v1 AT1511-1T ori-ica Benjamin A. Casper, Minneapolis, Mum.

Application Aumt zo, 193s, sei-n1 N9. 96,9911V 2Claiml.

This invention relates to door abrading and cleaning machines and is an improvement upon the invention disclosed in my U. S. LettersPatent Number 1,879,083, granted September 27, 1932.

My' improved machine, vwhile well adapted for .use with abrasive rolls or drums of most types, is particularly adapted to utilize replaceable steel wool rolls or bufng elements of the general type disclosed in my above identiiled patent.

It is an object of my present invention to provide an improved and highly eillcient portable door abrading and cleaning machine capable of being manufactured at relativelylow cost, and preferably utilizing as a source of driving power an electric motor carried by a wheeled frame.

It is a further object to provide a portable machine of the class described wherein the abrasive element or roll is heldin tangential relation against the oor or other surface to be treated and is provided with convenient means for varying its pressure against the floor.

Another object is to provide a machine of the class described wherein the rotary abrasive elements or rolls may be very quickly and easily changed or replaced and wherein material and dirt rubbed from the surface treated or-from the abrasive roll is prevented from scattering and being distributed rearwardly of the machine in its travel over the door.

Another object is the provision of an abrading machine especially well adapted for eiiiciently and rotatively applying an abrasive element constructed of steel wool illaments spirally wound about a spool or drum in successivelayers and wherein means are .provided for driving then Cit abrasive element in a direction against the movement or travel of the machine over the'iloor.

A still further object is to provide a iioorabrading machine having an auxiliary .abrasive elethereof and secured to and driven from the main` abrasive element. This auxiliary element enables the machine to eiilciently treat corners and surfaces adjacent toirregular or recessed walls, and the like.

Another object is t6 provide an improved steel wool roll of the class described,A having reinforced ends or edges which materially increase 50 its and emcleny.

These and` other objects will be more apparent in the following description made in connectionl with the accompanying drawings. wherein like 55 throughout the several views and wherein;l

steel wool is wound 'Figure 1 vis a side elevation ot an embodiment of my improved machine.

Figure 2 is a top plan view ot the same. Figure `3 is a bottom plan view of the machine, with the chain case shown in section. 5 AFigure 4 is a-cross section on a larger scale taken on the line 4 4 of Figure 2.

Figure 5 is a vertical section taken substantially on the line [-6 of Figure 2, showing the construction and mounting ofthe roll elevating 10 and adjusting means as well as the hood covering the upper portion of the roll.

Figure 6 is a fragmentary vertical section taken on the line 6 6 of Figure 5 and showing the manner in which the abrasive drum is keyedto 15 the spool and retained against longitudinal dl s placement.

Figures 7 and 8 are elevations showing the respective ends oi the spool.

Figures 9 and 10 are elevations showingV the 20 inner ends of the two spool engaging elements.

Figure 11 is a fragmentary section view show ing the driving engagement between one end oi the drum and one of the drum engaging members.

Figure 12 is a view partly in side elevation and partly inaxial section of a suitable type of steel wool abrasive element.

Figure 13 is a perspective view oi' said element showing the manner in which the metal fibers or upon the spool of cylindrical shell. v

Figure 14 is a fragmentary cross section taken on the line II'I4 of Fig. C; and

Figure 15 is a fragmentary perspective view 35 showing the manner in which the abrasive drum is keyed to the spool and retained against longitudinal displacement. I

In the form of my invention illustrated'a sub- .40 ment laterally projecting fram one of the sides Stntiauy hol'lmtal frame Il is Provided whim 40 may conveniently be in the form of a casting or .heavy plate having a pair of parallel widely spaced and `forwardly extending arms lla for supporting the abrasive-roll. Frame Il as shown includes parallel rearwardly extending arms 1lb, 45

the rear ends oi' which are bi-iurcated for the at- Itachment of rear supporting wheels it. A suitable electricmotor-M is secured to the top of arms lIll with its armature shaft positioned horiaontally and transversely ot the frame. 'I'he base 50. oi' 'the motor. M may be conveniently secured to s lboolttedlportions oi' arms lIll by means of nutted Between the rear arms lib of the framean ad- Justable yoke Il isswingabiymountedonapin I3, said yoke at its u-.shaped or free end carrying a transverse axle 20 on kthe ends of which are .mounted small supporting wheels 2|.

23 to facilitate the turning thereof and c0nse-.

quently the adjustment of wheeled yoke Il.

An upstanding attachment bracket 25 is secured to the rear end of frame I5 straddling the arms |b of the frame and an elongated push handle 2B is adjustably secured to said bracket,

as shown, by means of a pivot bolt 21. Bracket 25 is provided with a toothed sector 25a adapted to be engaged by a retractable tooth carried at the lower end of a release rod 28 which extends longitudinally of handle'26 and is urged downwardly by resilient means, such as the spring 28a. connected with the upper and bent I portion 22h of the rod which constitutes an operating handle. Elongated push handle 20 terminates at its upper or outer end in a cross bar provided with suitable hand grips 26a. be of tubular construction to accommodate an electrical service cord 23 which is adapted to supply motor M.

A cylindrical roll-carrying drum 20 is mounted horizontally and transversely between the for- -ward arms I5a of the frameas shown having the ilat ends 20a and 20h respectively and provided with an axially disposed tubular portion c for accommodating a'locking shaft. 'I'he end 22a of the drum is provided with a radial groove or keyway 20d and the opposite end 20h is provided.

with a diametric keyway or groove 23e extending from the. peripheral edge of the end to the central aperture through the end. A pair of combined journal and drum-engaging members 2| and 22 respectively are provided, journaled insultable bearings 33 which are mounted in the outer portions of the arms |5a of the frame. Bear- 'ings 23 may be suitably lubricated by grease cups 34 threadedly attached to the upper sides of arms |5a. The journal and drum-engaging member 3| comprises a disk having a rib or key 2 la at the outer end thereof adapted to engage the groove 20d at one end of the drum 32 and said disk carries a tubular stub axle or journal 2lb extending normally thereto, and projecting some distance beyond the outer end of the left hand bearing 22 shown in Fig. 4. The journal and drum-engaging member 22 comprises a substantially sim-'- ilar disk having, however, a diametrlc rib 22a for engagement with the groove 23e formed in.

the end 20h of the drum. The stub axle 22h of the-member 22 extends'some distance beyond the outer side of the arm |5a wherein it is mounted and has aillxed to theouter end thereofv a sprocket 25 which is driven by means of a chain 25 from a sprocket 21a aillxed to the outwardly pro- `jecting end of the armature shaft 21 of motor M. A suitable chain case 2l encloses sprockets 25 and 421a and the chain 25, and said c'asc may be conveniently-secured to theouter side of the adjacent arm Ila and is prelerabLv provided with Y ma detachable face lplate 22a.`

The journal'member 2| has an axial bore for receiving alccking rod or shaft 22 which rod also Handle 25 may threadedly engaging a socket provided in the inner end of journal member 32 and having at its left hand end, as shown in Fig. 4, a knurled knob 23a to facilitate its turning. Drum 30 detachably carries au abrasive roll which is preferably constructed by helically winding a multiplicity of steel wool illaments upon a cylindrical spool or shell 40, the winding of said laments forming successive and spiral layers of abrasive material and the roll being substantially cylindrically shaped. The peripheral wall of the drum 20 is provided with a longitudinal groove for receiving an internal spline or rib 40a formed in the cylindrical shell 40, the connection of said elements xing the roll to the drum 30 for driving. Retaining or locking means are provided to prevent longitudinal displacement of the spool and roll from the drum and, as clearly shown in Fig. 6, said means may comprise a small slidable retaining bolt 4| radially mounted upon the end 20a of drum 30 adjacent -th'e peripheral edge thereof and slidably afiixed thereto by a pin. workingin a suitable longitudinal slot provided in the bolt. A small spring pressed plunger 4-2 extends through drum end 20a and is adapted to abut the turned inner end of bolt 4| to hold the bolt in outwardly projected retaining position. Plunger 42 may be guided by drum end 30a and at its inner end by a suitable fbracket 42a.

mounted on the interior of drum end a. A coiled spring 42h is interposed between the off set end of bracket 42a and an abutment or pin ilxed to the medial portion of plunger 42, normally holding the plunger outwardly.

An. auxiliary and rotary abrasive element may be amxed to the outer end of journal member 3|, as clearly shown in Fig. 4, this auxiliary element comprising a relatively short drum 43 having `a closedinner end and an open outer end through whichaccess may be had to the knob of locking ,rod 22. 'l'.'he closed end of 43 may be provided with an outwardly projecting boss 43a sur- -rounding the projecting end of the stub axle 3|b and being fixed thereto by suitable means such as the set screw 44. Drum 42 carries a replaceable auxiliary abrasive roll which is constructed` in a manner similar to the main abrasive roll,

comprising a multiplicity of metallic or steel wool rnlf'iments.helically wound upon the thin open ended cylindrical spool 45. Spool 45 is keyed to the drum 42 in a manner similar to the attachment of the main abrasive roll, and is prevented irom outward longitu displacement by retaining mechanism indica d as an entirety by the numeral 45, of similar construction to the vretaining mechanism previously described which is carried by the drum 20.

, iObviously the machine may b e operated with the auxiliary abrasive element removed and in this instance the locking rod 39 is screwedin- `viraidlir until its head or knob 39a is clamped tightly against the outer end of journal or stub agie 2lb of the drum engaging member 3|.

.A segmental shaped hood 41 is provided for covering the upper portion of the main abrasive element. as shown, said hood having substantially semi-circular vertical ends 41a, the lower edges of which may conveniently be supported upon the tops of the arms `|5a of the frame. Hood 41 is hinged at its rear edge to the intermediate and transverse portion of frame I5 in order that it.

may be swung back against the top of the motor extendsthroughtubularportioncoorthcdruxral auxiliary hood 42 adapted to cover the upper 75 As shown in Figs. 12 and 13 my abrasive ele- -ments are preferably constructed by helicaily winding a multiplicity of metal laments such as steel Wool upon a suitable spool 40. 'I'he multiplicity of filaments are preferably directed for windingin the forml of a thin ribbon and. the spool is wound from one end to the other and reversely to form successive spiral layers of the filaments, effecting a cylindrical external shape of the roll. The ends of the roil so formed are impregnated with some adhesive self-hardening material, such as sodium silicate (water glass) which stiffens and reinforces the roll and prevents slippage or displacement of the filaments over the ends of the roll. 'I'his stiflening of they ends of the roll has been found to add materially to the durability and emciency of the construction.

Operation `The main abrasive element is` operatively mounted in the machine by releasing and removing locking rod 39, sliding the main drum outwardly frontl its key engagement with the drum engagement members 3| and. 32 and then slipping the roll carrying spool over the drum with the rib 40a engaging the small groove `provided on the external periphery of drum 30. Drum 30 may then be slipped back onto the machine by properly engaging the grooves 30d and 30e with the keys or ribs 3|a and 32a of the spaced di m engaging members. Drum 30 .clips into place easily and the tubular lo'ck shaft receiving portion of the drum is axially aligned with the bore of member 3| and the threaded the traveling movement of the frame. With steel socket of member 32. The locking rod or shaft 39 is then slipped through drum engaging member/3| .through the central and tubular portion 30e of the drum and is screwed into the socket of member 32 drawing members 3| and 32 tightly' against the ends 30a and 30h of the drum.

The drum 30 and abrasive element are driven in a direction against themovement or travel of the machine over the floor and when the abrasive roll is applied to the drum 3|) .the loose ends of the filaments of the roll extend rearwardly of the machine at the bottom of the roll so that the revolution of the roll will tend to compact the filaments rather than to unwind the same from the roll.

The frame adjustment screw 23 and wheeled yoke I3 may be adjusted to supportthe abrasive roll in spaced relation from the floor or 'supporting surface and when itis desired to operate the machine, yoke I3 may be raised causingthe frame and motor M to be partially supported by the abrasive roll. The pressure -of the'abrasive roll against the floor may thus be varied in accordance with the raised position of the wheels 2|. In operating thei machine, it is, of course, pushed across the floor and the filaments of the roll are held tangentially to the surface to be treated and the roll is driven by motor M against wool rolls of the type herein `described the helicaily wound.filaments abrasively treat the floor or surface longitudinally, penetrating the grain or interstices of a wooden f loor and producing excellent results.

The ane sawdust, dirt and-other materiau' abrasively removed from the floor, .as well as the metallic dust and small fragments of the fila.-y

.locked position. ments worn from the roll are caught by the hood jacent a' wall or the mop board applied tofa wall,

my auxiliary abrasive roll is quickly mounted on 10 the machine by removing locking rod 39, slipping the bossed portion 43a of the drum over the outer projecting end' of the` journal or stub axle 3|b ofthe drum engaging member 3| and then locking the auxiliary drum in piace and tightening l5 the set screw M It will then be seen that the auxiliary abrasive rollis disposed at, the extreme side of themachine and may treat the door surface'up to the wall or mop board.

From the foregoing description it will be apparent that I have provided al comparatively simple, very durable and highly eflicient floor abrading machine wherein the abrasive rolls may be very quickly and easily replaced, wherein pressure of the rotary abrasive'element against the fioor'may be nicely varied and wherein the dirt and material rubbed from the surface treated or from the abrasiveroll is prevented from scattering in the operation of the machine. v

It will further be seen that Ihave provided an improved, highly efficient rotary abrasive element comprising a multiplicity of helicaily wound metal filamentsand constructed for great durability.

It will, of course, be understood that various changes may be made in the form, details, Droportions and arrangement of the parts, without departing from the scope of my invention, which, generally stated, consists in a'device capable of carrying out the objectsabove set forth 'and in the novel parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. In a floor abrading machine, a frame comprising a pair of forwardly extending spaced arms, an abrasive drum, a pair of drum driving elements comprising plates in engagement with the ends of said drum and having stub axles extending outwardly therefrom, one of said stub axles having an axial bore entirely therethrough and the other of said axles having a threaded axial socket therein,'said drum having anaxial aperture therethrough in alignment with the aperture in one of said stub axles and the threaded socket of the other of said axles, and a threaded rod extending through the apertures in said axle and havingV a key structure slidable into said drum groove, a movable locking element on said 'l0 drinn engaging an end of said sleeve to secure the same on s aid drum, and a spring held retainer normally retaining, said locking element in A. cesena' te' 

